Thanks for keeping an interest Bill.
Yes, I'm afraid so, they're taking a percentage as well as the bonus. I finally got contact with them last night - they have a single poor guy processing all this (business hours, aussie east coast time, says he's almost caught up the backlog). He fixed my ID situation so I could withdraw, but told me the bonus will be removed, and "all related winnings".
In other words, if you deposited 300+ and got a 100 bonus, you are considered to have been using 75% your money, 25% the books. They are ignoring how far through the bonus requirements you are (I was 90%), and thus removing 100 + 25% of your balance. Worse, if you had a 100% bonus, they're taking half (one guy on another forum lost $2500 as a result).
Aside from treating customers as if they reneged on bonus conditions, rather than the book suddenly yanking all its lines without warning (we could all have completed bonus requirements given even a week's notice), this is extremely financially advantageous to them. For example, I had 500 pounds more to complete the bonus requirements. Had I placed that, it would have lost on average 5% (their soccer market juice), ie 25 pounds. Instead they're going to take something in the region of 450 pounds ($900) from my 1418 balance.
Given every deposit into the book attracted a bonus, they're going to be taking 25% - 50% of nearly everyone's balance.